Example of while loop

#!/usr/bin/env python3

'''Example of a while loop
Only 1 user: 'mark' with password 'spoon'
'''
def rec_pass(password, tries):
    '''checks password for a number of tries'''
    if password == 'spoon':
        return 1
    elif tries == 1:
        return 0
    else:
        return rec_pass(input('Enter Password: '), tries-1)

def _main():
    exit_flag = 1
    while exit_flag == 1:

        username = input('Enter username: ')
        if username == 'mark':
            print('O Hai! {}!'.format(username))
        else:
            print('Unknown User!')
            continue

        access = rec_pass(input('Enter Password: '), 3)
        if access == 1:
            print('Access Granted')
            break
        else:
            print('Max retries reached')
            exit_flag = 0

    else:
        print('Invalid Password! Program Terminated')

if __name__ == '__main__':
    _main()